# 单行赋值

a, b = 54, 45
print("a is {:d} and b is {:d}".format(a, b))

# do change
print("do exchange a, b = b, a")
a, b = b, a

print("after exchange, a is {:d} and b is {:d}".format(a, b))


print("-----------------分割线-----------------")

data = ("Nanjing", "Jiangsu", "China")
city, province, country = data

print("Country:{:s}, Province:{:s}, City:{:s}".format(country, province, city))
